A. Yard Requirement For Each Lot: No part of a yard or other open space provided about any building for the purpose of complying with the provisions of this title shall be included as part of a yard or open space required for another building.
B. Frontage Fifty Percent Or More: Where fifty percent (50%) or more of a frontage is occupied by buildings having setbacks which are greater or less than the setback required by this title for the district in which such frontage is located, the setback on the remainder of such frontage shall be the average setback of such buildings.
C. Frontage Less Than Fifty Percent: Where less than fifty percent (50%) of a frontage is occupied by buildings, the following setbacks shall apply:
1. Where a vacant lot abuts an occupied lot having a setback greater than is required by this title, the setback on the abutting vacant lot shall be the average of the setback required by this title for the district in which such lot is located and the setback on the occupied lot, or the average of such required setback and the lesser of the setbacks on the occupied lots, if the vacant lot abuts more than one occupied lot in the same frontage.
2. Where a vacant lot abuts a lot occupied by a building which has a setback less than is required by this title, the setback on the vacant lot shall be the average setback between that required by this title for this district and the setback of the occupied lot.
D. Enlarging Or Altering Buildings: No part of any building which has a setback less than is required by this title shall be enlarged or structurally altered within the front yard established by the setback required by this title for the district in which such building is located.
E. Buildings On Through Lots: Buildings on through lots and extending from street to street may waive the requirements for a rear yard by furnishing an equivalent open space on the same lot in lieu of the required rear yard; provided, that the setback requirements on both streets be complied with.
F. Exceptions To Open Yard Requirements: Every part of a required yard shall be open and unoccupied by any structure from the ground upward, except as follows:
1. Architectural Features: Sills, belt courses, cornices, canopies, eaves and ornamental architectural features may project into a required yard not more than thirty inches (30"); provided that no such feature shall project over a street line.
2. Bay Windows, Balconies And Chimneys: Bay windows, balconies and chimneys may project into a required yard not more than three feet (3') in any case, but not more than twenty percent (20%) of the width of any side yard which does not abut on a street; provided that the total length of such projections shall not be more than one-third (1/3) of the length of the building wall on which they are located.
3. Fire Escapes: Fire escapes may project into a required yard not more than five feet (5') in any case, but not more than twenty percent (20%) of the width of any side yard which does not abut on a street; provided that no such fire escape need be less than three feet (3') in width.
4. Uncovered Steps And Landings: Uncovered steps and landings may project into a required yard not more than six feet (6') in any case, but not more than twenty percent (20%) of the width of any side yard which does not abut on a street; provided that no such steps or landings shall extend above the main or entrance floor, except for a railing not more than three feet (3') in height.
5. Platforms, Walks And Drives: Platforms, walks and drives extending not more than six inches (6") above the average ground level at their margins, and retaining walls, when the top of such wall is not more than six inches (6") above the average level of abutting ground on one side, may be located in any yard.
6. Fences, Screening And Plantings:
a. No fence, screening or plants shall be placed or maintained closer than three feet (3') to a front lot line or a side lot line along a street, nor shall be more than four feet (4') in height in a front yard, nor more than two and one-half feet (21/2') in height in a vision triangle, as measured from the height of the street at the intersection of the two (2) streets.
b. No fence or screening shall be constructed more than six feet (6') in height on a rear yard lot line or on a side yard lot line that is not on the street side, nor more than four feet (4') in height in the portion of such side yard that is closer than ten feet (10') to the building setback line. Height limit may be increased to eight feet (8') in a yard between a residential lot and a nonresidential use from a rear lot line to within three feet (3') of the street line.
c. The provisions of subsection F6b of this section shall apply to automotive salvage licensees and applicants.
G. Vision Clearance Setback: There shall be a vision clearance setback line connecting the points at which the required front and side street setback lines on a corner lot, when projected, intersect the street lines. Within the space bounded by such vision clearance setback line and the street lines, no vehicle shall be parked and no structure or object of natural growth shall be constructed, maintained or permitted to grow between a height of two and one-half feet (21/2') and ten feet (10') above the elevation of the street pavement at the centerline, or the elevation of the top of the curb, if there be a curb. This regulation shall not apply to the trunks of trees, fence posts not over six inches (6") square or in diameter, retaining walls used to support ground at or below its natural level or wire fences so designed and constructed as not to constitute a substantial obstruction to the view of motorists and pedestrians across the vision clearance opening from one street to another. (1975 Code Ch. 18 § IV)